The control of apical dominance is due to interaction of auxins, cytokinins and a newly discovered plant hormone called as:
1. Brassinosteroids
2. Jasmonates
3. Salicylic acid
4. Strigolactones
Many mutants that are especially prone to wilting are deficient in:
1. ABA
2. Ethylene
3. Cytokinins
4. Gibberellins
Hyponastic response in submerged plants may be due to auxin and:
1. ABA
2. Ethylene
3. Cytikinin
4. Gibberellins
The newly discovered PGR brassinosteroids have effects qualitatively similar to:
1. Auxins
2. Gibberellins
3. Cytokinins
4. Ethylene
The plant hormones that are produced by wounded plants and play a key role in controlling plant defences against herbivores as well as responsible for enchanting fragrance of jasmine are:
1. Brassinosteroids
2. Strigolactones
3. Jasmonates
4. Auxins
The most important colors in regulating photomorhogenesis in plants are:
1. Violet and Yellow
2. White and Black
3. Green and Orange
4. Red and Blue
The biologically active form of the phytochrome is:
1.
2.
3. Both
4. None
When lettuce seeds illuminated by red light are then exposed to far red light:
1. is converted to and germination is inhibited
2. is converted to and germination is initiated
3. is converted to and germination is inhibited
4. is converted to and germination is initiated
Etiolated seedlings become normal when exposed to:
1. Blue light
2. Green light
3. Red light
4. Far red light
An incandescent light bulb has a high output of red light. Which of the following plant process will be least promoted by it:
1. photosynthesis.
2. seed germination.
3. phototropism.
4. flowering.